Hi Mel,
On Fri, Jan 20, 2006 at 11:54:55AM +0000, Mel Gorman wrote:
>
> This patch adds the core of the anti-fragmentation strategy. It works by
> grouping related allocation types together. The idea is that large groups of
> pages that may be reclaimed are placed near each other. The zone->free_area
> list is broken into RCLM_TYPES number of lists.
>
> Signed-off-by: Mel Gorman <[email protected]>
> Signed-off-by: Joel Schopp <[email protected]>
> diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc1-mm1-001_antifrag_flags/include/linux/mmzone.h linux-2.6.16-rc1-mm1-002_fragcore/include/linux/mmzone.h
> --- linux-2.6.16-rc1-mm1-001_antifrag_flags/include/linux/mmzone.h 2006-01-19 11:21:59.000000000 +0000
> +++ linux-2.6.16-rc1-mm1-002_fragcore/include/linux/mmzone.h 2006-01-19 21:51:05.000000000 +0000
> @@ -22,8 +22,16 @@
> #define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
> #endif
>
> +#define RCLM_NORCLM 0
> +#define RCLM_EASY 1
> +#define RCLM_TYPES 2
> +
> +#define for_each_rclmtype_order(type, order) \
> + for (order = 0; order < MAX_ORDER; order++) \
> + for (type = 0; type < RCLM_TYPES; type++)
> +
> struct free_area {
> - struct list_head free_list;
> + struct list_head free_list[RCLM_TYPES];
> unsigned long nr_free;
> };
>
> diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc1-mm1-001_antifrag_flags/include/linux/page-flags.h linux-2.6.16-rc1-mm1-002_fragcore/include/linux/page-flags.h
> --- linux-2.6.16-rc1-mm1-001_antifrag_flags/include/linux/page-flags.h 2006-01-19 11:21:59.000000000 +0000
> +++ linux-2.6.16-rc1-mm1-002_fragcore/include/linux/page-flags.h 2006-01-19 21:51:05.000000000 +0000
> @@ -76,6 +76,7 @@
> #define PG_reclaim 17 /* To be reclaimed asap */
> #define PG_nosave_free 18 /* Free, should not be written */
> #define PG_uncached 19 /* Page has been mapped as uncached */
> +#define PG_easyrclm 20 /* Page is in an easy reclaim block */
>
> /*
> * Global page accounting. One instance per CPU. Only unsigned longs are
> @@ -345,6 +346,12 @@ extern void __mod_page_state_offset(unsi
> #define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
> #define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)
>
> +#define PageEasyRclm(page) test_bit(PG_easyrclm, &(page)->flags)
> +#define SetPageEasyRclm(page) set_bit(PG_easyrclm, &(page)->flags)
> +#define ClearPageEasyRclm(page) clear_bit(PG_easyrclm, &(page)->flags)
> +#define __SetPageEasyRclm(page) __set_bit(PG_easyrclm, &(page)->flags)
> +#define __ClearPageEasyRclm(page) __clear_bit(PG_easyrclm, &(page)->flags)
> +
You can't read/write to page->flags non-atomically, except when you
guarantee that the page is not visible to other CPU's (eg at the very
end of the page freeing code).
Please use atomic operations.
-
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